autoconf/automake

Hi!
I've added autoconf/automake support to rhash. The main motivation was a properly libtoolized librhash, since other projects are using the library.
As the commit log says, there are some open points, which I can't address, I hope you can work on those:
    Some of the custom targets were not ported (RPM, Debian package, other binary distribution files).
    Windows support needs to be re-done, I can't test that.

gettext and bindings/ support could also be improved, but my first try for gettext was a lot of effort and went nowhere, so I'd like to know if you're interested in the autoconf project at all before continuing.

I hope you find this useful.
 Thomas